Submission #1091203

#	Time	Username	Problem	Language	Result	Execution time	Memory
1091203		kukuk	Arranging Shoes (IOI19_shoes)	C++14	100 / 100	52 ms	21956 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
#define all(x) (x).begin(), (x).end()
typedef long long ll;
typedef unsigned long long int ull;
const ll md = 1e9+7;
const int ukr = 2e5+10;
int read() {
    int ketek = 0; bool ne=0;
    register char c = getchar();
    while(c == ' ' or c =='\n') c =getchar();
    if(c=='-'){ne = 1; c = getchar();}
    while(c >= '0' and c <='9') { ketek = (ketek<<3)+(ketek<<1)+c-'0'; c = getchar();}
    if(ne) ketek*=-1;
    return ketek;
}   
void print(int x) {
    if (x < 0) {putchar('-');x = -x;}
    int len = 0, buf[10];
    if (x == 0) {putchar('0');return;}
    while (x > 0) {buf[len++] = x % 10; x/=10;}
    while (len > 0) {putchar('0' + buf[--len]);}
}
void File_Work(){
	freopen("test.in","r",stdin);
	freopen("test.out","w",stdout);
}
int n, m, a, b, c, d, id;
struct babi{
    ll x, y, id;
};
struct babis{
    ll x, y;
};
ll gcd(ll a, ll b) {
   if (b == 0) return a;
   return gcd(b, a % b);
}
ll pgkt(ll rnx, ll rny){
    if(rny == 0) return 1;
    ll nwrn = pgkt(rnx, rny/2);
    if(rny%2){
        return (((nwrn*nwrn)%md)*rnx)%md;
    }else{
        return (nwrn*nwrn)%md;
    }
}
vector<int> v;
string s;
ll fen[ukr];
vector<ll> ki[ukr];
vector<ll> ka[ukr];
vector<pair<ll,ll>> pas;
void upd(ll rn){
	for(; rn < ukr; rn += (rn&-rn)){
		fen[rn]++;
	}
}
ll get(ll rn){
	ll tot = 0;
	for(; rn > 0; rn -= (rn&-rn)){
		tot += fen[rn];
	}
	return tot;
}
ll count_swaps(vector<int> s) {
	n = s.size();
	for(int i = 0; i < n; i++){
		if(s[i] < 0){
			ki[-s[i]].push_back(i);
		}else{
			ka[s[i]].push_back(i);
		}
	}
	ll ans = 0;
	for(int i = 0; i < n; i++){
		while(!ki[i].empty()){
			if(ki[i].back() > ka[i].back()){
				ans++;
				swap(ki[i].back(), ka[i].back());
			}
			pas.push_back({ki[i].back(), ka[i].back()});
			ki[i].pop_back(); ka[i].pop_back();
		}
	}
	sort(all(pas));
	for(auto [l, r] : pas){
		ans += r-l-1-(get(r)-get(l));
		upd(r);
	}
	return ans;
}
/* void solve(){
	cin >> n;
	vector<int> sem;
	for(int i = 0; i < 2*n; i++){
		cin >> id;
		sem.push_back(id);
	}
	cout << count_swaps(sem) << "\n";
}
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
	int t =1;
    //cin >> t;
    for(int i = 1; i <= t; i++){
        //cout << "Case " << i << ": ";
        solve();
    }
} */

Compilation message (stderr)

shoes.cpp: In function 'll count_swaps(std::vector<int>)':
shoes.cpp:88:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   88 |  for(auto [l, r] : pas){
      |           ^
shoes.cpp: In function 'void File_Work()':
shoes.cpp:26:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |  freopen("test.in","r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
shoes.cpp:27:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |  freopen("test.out","w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 15 / 15